The following day I contacted the vendor (JYElectronicStore) and they posted me a "DAC optical out" adapter, next day delivery. Ive had this headset for 4 months now. Nevertheless, I stayed with it, and Patricia Ellis was pretty good as Judy. You can also find the headphone jack input and USB-C female port for charging as well as the USB DAC function. I only tested the low end and found that 20Hz (listed on the packaging) was the most accurate (which you only feel, not hear). I thought it was going to have cushion footbed like thier shoes, but it doesn?t feel like the same type of insole that their clogs and shoes have, so when I walk in them the insoles do not feel soft and cushiony and not comfortable at all. No hooks, nothing, nada, never. If youre 25cm you should get the 8. Im 7 months pregnant and was looking for something to wear around the house. Not terrible for $30 but wont buy again.